import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/login")
public class LoginServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String username = req.getParameter("username");
        String password = req.getParameter("password");

        if ("zhangsan".equals(username) && "123456".equals(password)){
            HttpSession session = req.getSession();
            // 往会话中存取登录信息
            session.setAttribute("username", username);
            session.setAttribute("count", 0);
            resp.sendRedirect("index");
        }else {
            resp.getWriter().write("failed");
        }
    }
}